Looking rather like an alien ship entering the atmosphere in a Spielberg-Lucas space spectacular, this composite color image from the Hubble Space Telescope reveals the bow shock caused by the stellar wind of a young star called LL Orionis. What causes this effect? Still in its relatively early years, LL Orionis produces a far more energetic wind than our middle-aged Sun. In this picture, that wind is blowing against the slower-moving flow of the Orion Nebula. Above and to the right of the central image, a fainter star can be seen creating a similar bow shock as it navigates its way through the expanding gases of the nebula.